Police want to speak to this man after a passenger was reportedly assaulted at a west London Tube station.

It happened at Green Park station, close to Piccadillly, on March 8 shortly before 9pm. British Transport Police are calling it “an unnecessary attack”.

Police say the victim, a 36-year-old man, was waiting for a train on the northbound Jubilee line platform when another man sat next to him and punched him in the thigh with such force that he was left with a puncture wound to his leg.

The victim then attempted to challenge the man, but his attacker boarded a train and left.

The attack comes after a man had his wrist broken at a fast food restaurant Paddington station .

Detective Constable Denis Mahoney said: “Fortunately the victim was not seriously injured, but this was an unnecessary attack.

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“We are committed to ensuring the Tube network remains a safe place for everyone and have a zero tolerance approach to all forms of violence.

“Having studied CCTV from the station of the alleged assault, I am today issuing an image of a man who I think has information about what happened. I would like him to come forward and speak to us.”

Anyone with information can call 0800 405040, or text 61016, quoting reference 284 of 18/4/16. Information can also be passed anonymously to the independent charity Crimestoppers on 0800 555111.

In August last year a man was killed following following a fight at London Victoria station .